STAT 2215Q Lecture Notes - Lecture 1: Test Statistic, Grou, Asthma
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STAT 2215Q Full Course Notes
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Rank sum test ( monn whitney test ) Two independent samples (cid:2868) : median = median2 (cid:2869) : >/# Require : two samples came from populations that have roughly the same distributional shape. 5- take group 1 t=1+2+4. 5=7. 5 (cid:1845)=sd of ranks=1. 84. Useful for datasets that: have very small sample sixes, have non-normal distributions, cannot be transformed to normal, cannot use rank sum test because of large number of ties. Step 0 : choose an appropriate summary statistic of the data eg. sum, sum of ranks, etc. Step 1: compute the chosen statistic based on the two independent samples. Step 2: list all regroupings of the n1+n2 numbers into group sizes of n1 and n2. Step 3: count the number of regroupings that produce a test statistic value that is as or more extreme that the observed value. Let the number of regroupings be r. (r=((cid:3117)+(cid:3118)(cid:3117) ) ).
